Trump dropped 138 spots to 259 on the Forbes 400

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Traffic is seen moving along Pennsylvania Ave., in front of the Trump International Hotel in Washington, Friday, Nov. 3, 2017.

The presidency has been bad for Donald Trump's finances, with his personal net worth falling from $4.5 billion to $3.1 billion over the past two years, according to the latest Forbes billionaires list.

Trump dropped 138 spots to 259 on the Forbes 400, an annual measure of the richest people in the U.S. During that same period, Amazon founder and CEO Jeff Bezos rose to the top spot, with an estimated fortune 52 times greater than that of the president, at $160 billion.

Forbes attributed the decline of Trump's fortune to three main factors: e-commerce eating into the value of Trump's real estate holdings, the intrusion of heightened security at Trump's resorts, and Trump's own over-reporting of the size of his penthouse, NBC News reported.